Ok, since you guys ROCK, I throw this question AT YOU.
I have a 93 Merc. Marquis with 210k. Runs GREAT!!! Motor, drive line never been touched.
Only thig is that the car uses about 2-3 quarts of oil a month. Why bother even changing the oil with the burn at that rate? Couldn't I just change out the filter and go with it at that!? ha ha ha. Stupid question, but I ask anyway. I know, your thinking "He set this site up and he asks this type of question!?!?!?!" well, I am just curious. I am no car know it all, this is why I am here!
I would say that I still should drain the motor (oil) and change it, but was just wondering if it is a needed thing since it burns so fast!

If your not already doing so, I would recommend on running a thicker type of oil designed for older engines, and this should reduce some of the consumption.

I guess it comes down to how long you plan on keeping the car/engine though. If it was my car id just top the oil up like your doing now and change the oil and filter after every 6 or 9 months or so and just wait for the engine to die. Then just drop a second hand motor in there or scrap the car completely.

Well the car is a 93, but looking at it, even the motor you would think it had only 30k on it. Lets just say I keep my motors CLEAN!! She has leather and is in great shape, just with these Marq's and the 4.6 motor, it burns oil like heck! This motor I have learned and read in many places NOT to run thinker oil thru it caus the motor is not designed for thinker oils. I have read that the new oils for higher mile motors may slow down the burning.

With that many miles on it I would be looking at a rebuild or at the very least new piston rings and bearings. Can you rebuild the Romeo engine? Or you could fit a used 5.4 out of a truck. Either way I personally wouldn't rely on the warn engine oil for to long. BTW for those of us who use the REAL measurements 209,000 mile = approx 460,000km! No wonder it's burning oil!

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The idea of not replacing the oil makes sense. On large aircraft turbine engines there are no oil changes except at overhaul or shop visits. The constant topping up keeps the additive package at an adequate level, and filters are changed regularly. Many truck engine operators do the same, except they run additional filters called LTM or similar which are bypass filters. These trap contaminants down to 1 micron and separate water.

Having been in the engine reco game, DO NOT USE THICKER OIL in modern engines. It greatly accelerates wear rates, especially valve train. Good quality oil at the recommended grade will be the best choice.

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